Look for the"Making the Most of you ST" sections in early ST User Magazines.
Issues 1 and 2 have some cool small stuff and starting in issue three they have an ST Basic series on Animation.
In vole 2 issue 2, when it starts to become a full magazine, not just a section on Atari User, you'll find that they have moved on to C, BUT there should be "5 liners" that can be used in various versions of basic.
I loved ther ST basic interface, and if the yhad just ironed out some of the bugs and supplied a compiler early on, it could hace been a nice way for A LOT of Gem programs and games to have been created in PD.